1225245251 has 4 divisors (see below), whose sum is σ = 1227139632. Its totient is φ = 1223350872.

The previous prime is 1225245239. The next prime is 1225245277. The reversal of 1225245251 is 1525425221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1525425221 = 1811 ⋅842311.

It is a cyclic number.

It is not a de Polignac number, because 1225245251 - 2¹⁰ = 1225244227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225245221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946220 + ... + 947513.

It is an arithmetic number, because the mean of its divisors is an integer number (306784908).

Almost surely, 2^1225245251 is an apocalyptic number.

1225245251 is a deficient number, since it is larger than the sum of its proper divisors (1894381).

1225245251 is an equidigital number, since it uses as much as digits as its factorization.

1225245251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894380.

The product of its digits is 8000, while the sum is 29.

The square root of 1225245251 is about 35003.5034103731. The cubic root of 1225245251 is about 1070.0588813785.

The spelling of 1225245251 in words is "one billion, two hundred twenty-five million, two hundred forty-five thousand, two hundred fifty-one".